Phantom images. A phantom with a near horizontal flat edge between undiluted gelatine and a solution of Gd-DTPA, corresponding to a signal ratio of 1:3 in the edge boundary. a) Phantom image uninterpolated. b) Image a interpolated in the image space with a bicubic interpolation. The solid arrows point into the regions where Gibbs artifacts are visible, while the dashed arrows point into the in-between regions with no artifact. c) Image a but with zero-filling pre FFT interpolation. Figure 2 a (bottom right) shows the measured peak artifact signal loss in the bottom right corner.